Putting HashMap in jsonobject

Question

i building a json object that consists of nameValue pairs defined in a Hashmap

the issue i am having is when i invoke:

jsonObject.put(hashmap);

It adds the nameValue pairs like this:

name=value instead of name:value

Any thoughts?

Thanks

It seems this one: http://www.json.org/javadoc/org/json/JSONObject.html — Jonathan Naguin, Jul 03 '13 at 09:35

score 7 · Answer 1 · answered Jul 03 '13 at 09:57

7

Use JSONObject constructor. DON"T CREATE YOUR OWN since you might miss some cases such when the value is an array.

JSONObject jsonObject = new JSONObject(hashMap);

This is actually a complete solution since it covers for corner cases such as where the value is an array. Thus, it will make it as JSONArray for you.

answered Jul 03 '13 at 09:57

Multithreader

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4

Hate to dig up an old answer, but this does *not* work. The OP is asking for a conversion from `HashMap` to `JSONObject`. The constructor you mentioned only works with `HashMap` as made clear [here](https://stackoverflow.com/a/12155874/3551916) – ThunderStruct Jun 01 '17 at 03:15

score 6 · Accepted Answer · answered Jul 03 '13 at 09:35

6

Iterate through the HashMap and put to the jsonObject:

Iterator it = mp.entrySet().iterator();
while (it.hasNext()) {
    Map.Entry pairs = (Map.Entry)it.next();
    jsonObject.put(pairs.getKey(), pairs.getValue() );
}

answered Jul 03 '13 at 09:35

Jonathan Naguin

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that did teh trick. Why doesnt jsonObject.put automatically handle it? – Jono Jul 03 '13 at 09:55
@jonney I am not sure, the documentation doesn't contain any `put` method with only one parameter... weird – Jonathan Naguin Jul 03 '13 at 10:05
There exists a built-in JSONObject constructor which covers for cases such as where the value is an array – Multithreader Jul 03 '13 at 13:06

Putting HashMap in jsonobject

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